mirror of https://github.com/borgbackup/borg.git
Archive: allocate zeros when needed (#2308)
fixes huge memory usage of mount (8 MiB × number of archives)
(cherry picked from commit 883a7eefb2
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@ -204,6 +204,7 @@ class Archive:
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if start is None:
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start = datetime.utcnow()
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start_monotonic = time.monotonic()
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self.chunker_params = chunker_params
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self.start = start
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self.start_monotonic = start_monotonic
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if end is None:
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@ -227,7 +228,7 @@ class Archive:
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raise self.DoesNotExist(name)
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info = self.manifest.archives[name]
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self.load(info[b'id'])
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self.zeros = b'\0' * (1 << chunker_params[1])
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self.zeros = None
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def _load_meta(self, id):
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data = self.key.decrypt(id, self.repository.get(id))
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@ -405,6 +406,8 @@ Number of files: {0.stats.nfiles}'''.format(
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with backup_io():
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os.link(source, path)
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else:
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if sparse and self.zeros is None:
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self.zeros = b'\0' * (1 << self.chunker_params[1])
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with backup_io():
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fd = open(path, 'wb')
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with fd:
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